Oh good God. A reference to Oliver Stone's awful movie 'JFK'. Remember what I told you about conspiracists that quote lines from that movie, Shooter? It's not even the correct quote.
JoeA, see the pic I posted above of Oswald's Carcano 'C2766'. It's rough cosmoline-soaked furniture. You can't expect that the FBI crime lab would find latent prints on it any more than you'd expect to find fingerprints on the plastic receiver of a modern Glock pistol.
Fingerprints are also a very archaic police forensics method, just like 'parrafin tests'. I don't even think that the police commonly dust for fingerprints anymore on residential burglaries.
I’m not referencing Stone’s movie. I’ve got several bookcases full of material on the JFK assassination. And while fingerprints may be an archaic police method, if memory serves, the assassination took place a long time ago.